|Name|Type|Circle|Bench|Formed|Notes|
|---|---|---|---|---|---|
|Überlingen|Imperial City|Swab|SW|1268|1803: Mediatized to Baden|
|Ulm|1155: Free Imperial City|Swab|SW|1115|1803: Mediatized to Bavaria 1809: To Wurttemberg|
|Umpfenbach|Lordship 1805: HRE Princely County||||To Trauttmansdorff|
|Unterwalden|Imperial valley|||1415|Division into Nidwalden and Obwalden 1173: To Counts of Habsburg 1291: Nidwalden became a founding member of the Swiss League 1324: Immediate Imperial fief (Reichsunmittelbar) 1350s: Division into Obwalden and Nidwalden 1648: Left Empire as member of Swiss Confederation|
|Upper Salm|1163: County|||1170|Partitioned from Salm 1499: Raised to Wild- and Rhinegraves of Salm 1574: Divided into Salm-Salm and Salm-Grumbach|
|Upper Bavaria (Oberbayern)|Duchy|||1255||
|Upper Schönburg|County|Upp Sax||1569|Partitioned from Schönburg 1800: Partitioned into Schönburg-Hartenstein and Schönburg-Waldenburg|
|Urach|County||||1060: 1st mention of Urach 1080: 1st use of "Count of Urach" Division of territory into Achalm and Urach 1218 Egino I of Urach inherited County of Freiburg from Zahringen 1261: Counts of Urach died out 1251-1265: Ulrich I of Wurttemberg acquired territories of Counts of Urach|
|Uri|Imperial valley|||1231|Split off from Habsburg 1648: Left Empire as member of Swiss Confederation|
|Ursberg|1143: HRE Abbey|Swab|||1803; Secularized|
|Utrecht|Bishopric|Burg|EC|1024|1512: Burgundian Circle 1528: Secularized to Austria 1793: Council of Princes|
|Uznach|County|||||

Question: what is the number of the states in the holy roman empire that begin with the letter u?
Answer: 12